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Old 11-02-16, 06:22 AM   #12
stevehull
Steve Hull
 
Join Date: Dec 2012
Location: hilly, tree covered Arcadia, OK USA
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Nibs -

I would not have thought of RV water pumps being especially reliable and long lived compared to the "bumble bee" and other highly efficient water pumps. I have found that most RV infrastructure equipment does not seem to be especially reliable and certainly NOT inexpensive.

Don't know the cost comparisons, but any water circulation pump is easy to replace.

Yes, the use of a common loop length means less balancing issues.

I would look into the costs/reliability of: one pump, one manifold and thermostat controlled values on each loop. Each of these valves has a small gate valve built in so you can fine tune water (heat) flow in each loop.

Equal lengths of pipe can can different resistances due to numbers of turns, etc. But this small effect can be handled easily with the gate valve.

Less large current wiring (one pump), higher operating efficiency with one pump and simplicity of using inexpensive and incredibly reliable zone values (See Uponor for some nice stuff).

Great project.


Steve
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